<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>表单</title>
</head>
<body>

<form action="#"  autocomplete="off">
    <!--label-->
    <label for="username">姓名:</label>
        <input id="username"  name="username" type="text" placeholder="请输入姓名" required/><br>

    年龄: <input id="age"  name="age" type="number" value="30" placeholder="请输入年龄"/><br>
    <button type="submit">提交</button>
    <button type="reset">重置</button>
    <button type="button">按钮</button>

</form>
</body>
</html>